Its built for a .91 sized 4 stroke. If you stick with this it is an easy build and most of the work is done for you. You can prolly stuff the 1.2 in there but you will have to do more work and will prolly have some balance and fitting issues to deal with. Mine balanced perfectly with a saito 100. Unless you already have the 1.2 and are trying to not buy another engine I would stick with what was ment to go on it.

Your prolly not gonna have an easy time finding one at this point. They just came out last week and my LHS has 3 people on the waiting list for when more come in. I got the only one that showed up last week. It was supposed to be the owners but he knew how bad I had been waiting for it so he hooked me up. I would start calling around the shops in the area and see if any of them have any in stock or some being delivered in the near future that arnt already spoken for.

edit

check this post for places to get pulse 60
http://www.rcuniverse.com/forum/m_7480741/tm.htm